#include <iostream>
#include "stdio.h"
#include <algorithm>
using namespace std;
int main(){
    int a, b;
    char c;
    cin >> a >> b >> c;
    if (c == '+') cout << a + b << endl;
    else if (c == '-') cout << a - b << endl;
    else if (c == '*') cout << a * b << endl;
    else if (c == '/')
    {
        if(b == 0) cout << "Divided by zero!" << endl;
        else cout << a / b << endl;
    }else {
        cout << "Invalid operator!" << endl;
    }
    
}